var x1 >=0 ;
var x2 >=0 ;
var x3 >=0 ;
var x4 >=0 ;
var x5 >=0 ;
var x6 >=0 ;
var x7 >=0 ;
var x8 >=0 ;
var x9 >=0 ;
var x10 >=0 ;
var x11 >=0 ;
var x12 >=0 ;
var x13 >=0 ;
var x14 >=0 ;
var x15 >=0 ;
var x16 >=0 ;
var x17 >=0 ;
maximize obj: 0.0  + 0.0 * x1   -4.0 * x2   + 0.0 * x3   -2.0 * x4   + 3.0 * x5   -1.0 * x6   + 3.0 * x7   -4.0 * x8   + 3.0 * x9 ;
c1: x10 = -13.0  -3.0 * x1  + 7.0 * x2  -4.0 * x3  -2.0 * x4  + 0.0 * x5  + 7.0 * x6  + 7.0 * x7  + 9.0 * x8  + 10.0 * x9 ;
c2: x11 = 34.0  + 0.0 * x1  + 4.0 * x2  + 3.0 * x3  + 5.0 * x4  -8.0 * x5  -6.0 * x6  -8.0 * x7  -1.0 * x8  -5.0 * x9 ;
c3: x12 = 41.0  + 0.0 * x1  -3.0 * x2  -9.0 * x3  -9.0 * x4  + 8.0 * x5  -2.0 * x6  -9.0 * x7  + 6.0 * x8  -8.0 * x9 ;
c4: x13 = -49.0  + 10.0 * x1  -4.0 * x2  -7.0 * x3  + 6.0 * x4  + 7.0 * x5  + 8.0 * x6  -10.0 * x7  + 7.0 * x8  -5.0 * x9 ;
c5: x14 = 77.0  + 4.0 * x1  + 9.0 * x2  -7.0 * x3  -10.0 * x4  -3.0 * x5  + 0.0 * x6  -5.0 * x7  -8.0 * x8  -10.0 * x9 ;
c6: x15 = 69.0  -6.0 * x1  -7.0 * x2  + 5.0 * x3  -5.0 * x4  + 1.0 * x5  -9.0 * x6  + 2.0 * x7  -9.0 * x8  + 9.0 * x9 ;
c7: x16 = -44.0  -3.0 * x1  + 8.0 * x2  + 10.0 * x3  + 10.0 * x4  -5.0 * x5  + 8.0 * x6  + 9.0 * x7  + 7.0 * x8  -8.0 * x9 ;
c8: x17 = -13.0  + 8.0 * x1  -9.0 * x2  + 3.0 * x3  + 8.0 * x4  -9.0 * x5  + 6.0 * x6  + 1.0 * x7  + 8.0 * x8  -10.0 * x9 ;
solve; 
display 0.0  + 0.0 * x1   -4.0 * x2   + 0.0 * x3   -2.0 * x4   + 3.0 * x5   -1.0 * x6   + 3.0 * x7   -4.0 * x8   + 3.0 * x9 ;
 
 end; 
